Hello, I need help, i forgot my windows 8 password... and i cant use my pc... I don’t want to reinstall my system due to there some important work document on it, any way that i can use remove the password without system reinstallation? 
You can use windows password reset disk to change the password. It’s easy to make a reset disk with usb drive. However, you need another windows pc to burn the disk.
Here is a great article on this: how to reset forgotten password on windows 8
Please follow the guide to help yourself out.
thanks, but how can I create a password reset disk with USB? I have a USB drive with 2GB.
The recovery methods depend on whether you use a Microsoft account or local account to sign in to Windows 10. If you use a Microsoft account, just need to reset the password at https://account.live.com/password/reset
If you use a local account, you can reset the password by using a USB or CD flash drive.
To use a Windows 8 installation disk or recovery drive to reset Windows 8 local account password, follow this tutorial: http://www.top-password.com/knowledge/reset-forgotten-windows-8-password.html
Windows 8 ISO image could be downloaded for free from Microsoft.
If you are protecting your PC with Microsoft account then you can try reseting your MS password and it will resolve the issue.